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Ribeiro, Isabel A. C.; Faustino, Ce´lia M. C.; Guedes, Rita C.; Alfaia, Anto´nio J. I.; Ribeiro, Maria H. L. – Journal of Chemical Education, 2015
The transport of molecules across biological membranes are critical for most cellular processes. Membrane permeability is also a key determinant for drug absorption, distribution, and elimination. Diffusion, that is, the migration of matter down a concentration gradient, is a simple mechanism by which both endogenous and drug molecules can enter…
Descriptors: Chemistry, Physics, Science Experiments, Health Sciences
Metz, Steve, Ed. – National Science Teachers Association (NJ3), 2011
The concept of energy is central to all the science disciplines, seamlessly connecting science, technology, and mathematics. For high school and upper middle school teachers, this compendium comprises inquiry-based activities, lesson plans, and case studies designed to help teach increased awareness of energy, environmental concepts, and the…
Descriptors: Energy Education, Science Education, Secondary School Science, Grade 9
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Haynes, Henry W., Jr. – Chemical Engineering Education, 1986
Current chemical engineering textbooks teach that the driving force for diffusive mass transport in ideal solutions is the gradient in mole fraction. This is only true for ideal solution liquids. Therefore, it is shown that the appropriate driving force for use with ideal gases is the gradient in partial pressure. (JN)
Descriptors: Chemical Engineering, Diffusion (Physics), Engineering Education, Higher Education
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Brouwer, W.; Paranjape, B. V. – Physics Education, 1991
The forward force of water on a hose is calculated using only the pressure gradient, the radius and length of the hose. The misconception about recoil on the nozzle is discussed. Dissipation energy and the consequent heat generation in a fluid flow are also described. (KR)
Descriptors: College Science, Energy, Fluid Mechanics, Heat
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Moore, Randy – American Biology Teacher, 1984
Discusses graviperception and gravitropism by plant roots. Indicates that graviperception occurs via sedimentation of amyloplasts in columella cells of the root cap and that the minimal graviresponsiveness of lateral roots may be due to the intensity of their caps to establish a concentration gradient of inhibitor(s) sufficient to affect…
Descriptors: Botany, College Science, Gravity (Physics), High Schools